UGT1A1 and obesity due to melanocortin 4 receptor deficiency: In conclusion, our results demonstrate that suppressing hepatic UGT1A1 with GNUR increases plasma bilirubin levels, lowers the bilirubin catabolized product urobilin that is absorbed from the gut, reverses hepatic steatosis, and improves fasting hyperglycemia and hyperinsulinemia in a mouse model of established dietary-induced obesity and NAFLD.